Pressure estimation using the 'diamond Raman scale' at low pressures in diamond anvil cell experiments using a highly confocal Raman system

Taku Fujii, Hiroaki Ohfuji

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Pressure estimation using the frequency shift of the diamond Raman peak from the anvil culet is readily and widely used in diamond anvil cell experiments along with the conventional ruby fluorescence method. Here, we propose a modified diamond Raman scale particularly designed for pressure measurement below ∼10 GPa. A series of experiments were conducted using a highly confocal Raman system and H2O, ethanol/methanol mixture and NaCl samples loaded in a rhenium gasket which was pre-indented to 40-60 or 100-110 μm thick. The result showed that the frequency of the diamond Raman peak from the anvil culet increases linearly with pressure between 1 and 13 GPa, when using a sufficiently pre-indented (40-60 μm thick) gasket. The frequency shifts are calibrated against the pressure determined by the ruby fluorescence method, which is an alternative pressure scale. In addition, a preliminary measurement at high temperature up to 575 K suggests the potential application of this method for high temperature experiments.

Original languageEnglish
Article number025501
JournalMeasurement Science and Technology
Volume26
Issue number2
DOIs
Publication statusPublished - 2015 Feb 1
Externally publishedYes

Keywords

  • diamond Raman
  • diamond anvil cell
  • high pressure
  • pressure estimation

ASJC Scopus subject areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics

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